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International Urogynecology Journal

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Open Access 01-06-2016 | Review Article

Risk factors for recurrent obstetric anal sphincter injury (rOASI): a systematic review and meta-analysis

Authors: Swati Jha, Victoria Parker

Published in: International Urogynecology Journal | Issue 6/2016

Abstract

Objectives

The objective of this study was to estimate the risk of recurrent obstetric anal sphincter injury (rOASI) in women who have suffered anal sphincter injury in their previous pregnancy and analyse risk factors for recurrence through a systematic review and meta-analysis.

Data sources

A review was performed according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Searches were made in Ovid MEDLINE (1996 to May 2015), PubMed, EMBASE and Google Scholar, including bibliographies and conference proceedings.

Methods of study selection

Observational studies (cohort/case–control) evaluating rOASI and risk factors were selected by two reviewers who also analysed methodological quality of those studies. Pooled odds ratios (OR) for rOASI and individual risk factors were calculated using RevMan 5.3.

Tabulation, integration and results

From the eight studies assessed, overall risk of rOASI was 6.3 % compared with a 5.7 % risk of OASI in the first pregnancy. The risk in parous women with no previous OASI was 1.5 %. Factors that increased the risk in a future pregnancy were instrumental delivery with forceps [OR 3.12, 95 % confidence interval (CI) 2.42–4.01) or ventouse (OR 2.44, 95 % CI 1.83–3.25), previous fourth-degree tear (OR 1.7, 95 % CI 1.24–2.36) and birth weight ≥4 kg (OR 2.29, 95 % CI 2.06–2.54). Maternal age ≥35 years marginally increased the risk (OR 1.16, 95 % CI 1–1.35).

Conclusion

The overall rate of rOASI and associated risk factors for recurrence are similar to the rate and risk factors of primary OASI. Antenatal decisions could be based on assessment of foetal weight and intrapartum decisions based upon the requirement for an instrumental delivery.

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Title: Risk factors for recurrent obstetric anal sphincter injury (rOASI): a systematic review and meta-analysis
Authors: Swati Jha
Victoria Parker
Publication date: 01-06-2016
Publisher: Springer London
Published in: International Urogynecology Journal / Issue 6/2016
Print ISSN: 0937-3462
Electronic ISSN: 1433-3023
DOI: https://doi.org/10.1007/s00192-015-2893-4

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Risk factors for recurrent obstetric anal sphincter injury (rOASI): a systematic review and meta-analysis

Abstract

Objectives

Data sources

Methods of study selection

Tabulation, integration and results

Conclusion

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objectives

Data sources

Methods of study selection

Tabulation, integration and results

Conclusion

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